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Hey thanks alot! I talked to the tech today on the phone. He said it was pretty hard to figure out the humming unless you have something to compare it to (another amp). But I'll try your steps ! Thanks ; )

Its a combo, I havent had any problems with connections and such. Maybe previous owner did. I replaced the power tubes some time ago. Havent really got a clue when it comes to wiring and fuses there. But shouldnt a tech go through all this when he checks the amp? After all I told him to fix the...

That's the thing. Okay. This hum is only in lead channel, it's there even if the guitar isnt plugged in. If I pull down on the gain, drive or treble its reduced to the point where its gone when you remove all gain. But these are pretty common settings right? is it normal to have alot of hum /...

Okay, some days pass, and Im a little wiser hehe. Theres nothing wrong with the new tubes, but the humming is still there so it must be the amp. I have my Lead Drive all the way up on 10, gain: ca. 8, treble: ca. 7. So I understand that there would naturally be some noise, but is it supposed to...

I just got my Mk IV back from repairs. Turned it in because there was a HUGE humming noise in the background. The sound I had from before in it was awesome though, no problem there. Just the humming. (could this be caused by a faulty connection or something?) The previous owner said the tubes...

Haha, thanks. Well I just sent it to a shop some days ago to have someone look at it. Guess that cant hurt, but I think I'll get one of those tubes you mentioned anyways. I read through the manual, but what functions each tube has sort of went by me. Would be nice to know :) Also, has anyone...

Hi, got myself a sweet MKIV amp some months and the first thing I noticed when I played it was the insane amount of noise in it. Especially on the lead channel. When I asked another guy who owns a Mk IV, he said his didnt make as much noise as mine. So I bought a 12ax7 tube and replaced it with...

Aah, I see! Well, thanks for the help guys :D

Alright thanks mate :) What kind of custom cable would we be talking about anyways?

Hey, I was thinking of getting myself a "rig" here but I am in a little doubt. Im gonna buy a MKIV head if I can get ahold of one, and I already have a Gmajor effect processor. So Im gonna get a midi pedalboard so I can switch channels on the amp and change presets on the Gmajor at the same...

My FX loop is bypassed, so Ill just wait and see what happens when we change tubes :roll:

I actually convinced my mate to let me try out his tubes, so we'll do that asap. And Iv read through the manual too but havent tried out those settings. I suppost I can do that, but it wont change the fact that there is something wrong with my amp. (there has to be) .. I checked with another...

Aww ok. Im afraid thats out of the question since he lives pretty far away, and secondly is very overprotective of his Mesa :/ I guess Ill have to take it to a shop and have someone take a look at it, unless someone else has a solution.. thanks anyway :wink:

Well, Im not really good at describing sound. And my english is also a bit limited. But it doesnt really sound powerful.. or crunchy.. just alot dryer. But again im not really good at describing sound.

It may be the tubes yeah, but im talking about the amp sound in general. :roll:

Hey, Im new here to the forums and to Mesa Boogie amps in general. I bought a used (but almost new) recto 3 channel some weeks ago but im having problems with the sound. A friend of mine has a 2 channel one and it sounds very good. Mine sounds nothing like that. We even tried the excact same...